Watch Full Movie Online. Say “Hello!” to Halloween! It’s time for tricks and treats when Elmo and Abby visit Count von Count’s spooky castle for a special Halloween. Count cats and ghosts with them, play pattern games, and help them chase down a runaway pumpkin! Then find out what happens when someone is wearing the same costume as Elmo—eek! Do the Batty Bat dance as you get ready to celebrate Halloween with Elmo and all his friends! Ah, ah, ah!